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TPS55340: Output fails to reach desired voltage at startup sometimes

Part Number: TPS55340
Other Parts Discussed in Thread: LM3488

I have a custom board designed with the TPS55340 powering an array of LEDs.  I used Webench to design the circuit as a 12V->24V boost.  Both under normal load, and very light load the circuit fails to stabilize at 24V at startup sometimes.  Sometimes it does.  

Below are some scopes of both failed and successful startups.  ChannelA is Vout, B is SW at the Diode pin.
Bad Startup

I'm guessing it may be layout related, but to be honest this is my first prototype of my first board ever, so it's possible that everything is completely wrong!